--- /dev/null
+/*
+ * PIC32 deadman timer driver
+ *
+ * Purna Chandra Mandal <purna.mandal@microchip.com>
+ * Copyright (c) 2016, Microchip Technology Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/watchdog.h>
+
+#include <asm/mach-pic32/pic32.h>
+
+/* Deadman Timer Regs */
+#define DMTCON_REG 0x00
+#define DMTPRECLR_REG 0x10
+#define DMTCLR_REG 0x20
+#define DMTSTAT_REG 0x30
+#define DMTCNT_REG 0x40
+#define DMTPSCNT_REG 0x60
+#define DMTPSINTV_REG 0x70
+
+/* Deadman Timer Regs fields */
+#define DMT_ON BIT(15)
+#define DMT_STEP1_KEY BIT(6)
+#define DMT_STEP2_KEY BIT(3)
+#define DMTSTAT_WINOPN BIT(0)
+#define DMTSTAT_EVENT BIT(5)
+#define DMTSTAT_BAD2 BIT(6)
+#define DMTSTAT_BAD1 BIT(7)
+
+/* Reset Control Register fields for watchdog */
+#define RESETCON_DMT_TIMEOUT BIT(5)
+
+struct pic32_dmt {
+ void __iomem *regs;
+ struct clk *clk;
+};
+
+static inline void dmt_enable(struct pic32_dmt *dmt)
+{
+ writel(DMT_ON, PIC32_SET(dmt->regs + DMTCON_REG));
+}
+
+static inline void dmt_disable(struct pic32_dmt *dmt)
+{
+ writel(DMT_ON, PIC32_CLR(dmt->regs + DMTCON_REG));
+ /*
+ * Cannot touch registers in the CPU cycle following clearing the
+ * ON bit.
+ */
+ nop();
+}
+
+static inline int dmt_bad_status(struct pic32_dmt *dmt)
+{
+ u32 val;
+
+ val = readl(dmt->regs + DMTSTAT_REG);
+ val &= (DMTSTAT_BAD1 | DMTSTAT_BAD2 | DMTSTAT_EVENT);
+ if (val)
+ return -EAGAIN;
+
+ return 0;
+}
+
+static inline int dmt_keepalive(struct pic32_dmt *dmt)
+{
+ u32 v;
+ u32 timeout = 500;
+
+ /* set pre-clear key */
+ writel(DMT_STEP1_KEY << 8, dmt->regs + DMTPRECLR_REG);
+
+ /* wait for DMT window to open */
+ while (--timeout) {
+ v = readl(dmt->regs + DMTSTAT_REG) & DMTSTAT_WINOPN;
+ if (v == DMTSTAT_WINOPN)
+ break;
+ }
+
+ /* apply key2 */
+ writel(DMT_STEP2_KEY, dmt->regs + DMTCLR_REG);
+
+ /* check whether keys are latched correctly */
+ return dmt_bad_status(dmt);
+}
+
+static inline u32 pic32_dmt_get_timeout_secs(struct pic32_dmt *dmt)
+{
+ unsigned long rate;
+
+ rate = clk_get_rate(dmt->clk);
+ if (rate)
+ return readl(dmt->regs + DMTPSCNT_REG) / rate;
+
+ return 0;
+}
+
+static inline u32 pic32_dmt_bootstatus(struct pic32_dmt *dmt)
+{
+ u32 v;
+ void __iomem *rst_base;
+
+ rst_base = ioremap(PIC32_BASE_RESET, 0x10);
+ if (!rst_base)
+ return 0;
+
+ v = readl(rst_base);
+
+ writel(RESETCON_DMT_TIMEOUT, PIC32_CLR(rst_base));
+
+ iounmap(rst_base);
+ return v & RESETCON_DMT_TIMEOUT;
+}
+
+static int pic32_dmt_start(struct watchdog_device *wdd)
+{
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ dmt_enable(dmt);
+ return dmt_keepalive(dmt);
+}
+
+static int pic32_dmt_stop(struct watchdog_device *wdd)
+{
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ dmt_disable(dmt);
+
+ return 0;
+}
+
+static int pic32_dmt_ping(struct watchdog_device *wdd)
+{
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ return dmt_keepalive(dmt);
+}
+
+static const struct watchdog_ops pic32_dmt_fops = {
+ .owner = THIS_MODULE,
+ .start = pic32_dmt_start,
+ .stop = pic32_dmt_stop,
+ .ping = pic32_dmt_ping,
+};
+
+static const struct watchdog_info pic32_dmt_ident = {
+ .options = WDIOF_KEEPALIVEPING |
+ WDIOF_MAGICCLOSE,
+ .identity = "PIC32 Deadman Timer",
+};
+
+static struct watchdog_device pic32_dmt_wdd = {
+ .info = &pic32_dmt_ident,
+ .ops = &pic32_dmt_fops,
+};
+
+static int pic32_dmt_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct pic32_dmt *dmt;
+ struct resource *mem;
+ struct watchdog_device *wdd = &pic32_dmt_wdd;
+
+ dmt = devm_kzalloc(&pdev->dev, sizeof(*dmt), GFP_KERNEL);
+ if (IS_ERR(dmt))
+ return PTR_ERR(dmt);
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dmt->regs = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(dmt->regs))
+ return PTR_ERR(dmt->regs);
+
+ dmt->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(dmt->clk)) {
+ dev_err(&pdev->dev, "clk not found\n");
+ return PTR_ERR(dmt->clk);
+ }
+
+ ret = clk_prepare_enable(dmt->clk);
+ if (ret)
+ return ret;
+
+ wdd->timeout = pic32_dmt_get_timeout_secs(dmt);
+ if (!wdd->timeout) {
+ dev_err(&pdev->dev,
+ "failed to read watchdog register timeout\n");
+ ret = -EINVAL;
+ goto out_disable_clk;
+ }
+
+ dev_info(&pdev->dev, "timeout %d\n", wdd->timeout);
+
+ wdd->bootstatus = pic32_dmt_bootstatus(dmt) ? WDIOF_CARDRESET : 0;
+
+ watchdog_set_nowayout(wdd, WATCHDOG_NOWAYOUT);
+ watchdog_set_drvdata(wdd, dmt);
+
+ ret = watchdog_register_device(wdd);
+ if (ret) {
+ dev_err(&pdev->dev, "watchdog register failed, err %d\n", ret);
+ goto out_disable_clk;
+ }
+
+ platform_set_drvdata(pdev, wdd);
+ return 0;
+
+out_disable_clk:
+ clk_disable_unprepare(dmt->clk);
+ return ret;
+}
+
+static int pic32_dmt_remove(struct platform_device *pdev)
+{
+ struct watchdog_device *wdd = platform_get_drvdata(pdev);
+ struct pic32_dmt *dmt = watchdog_get_drvdata(wdd);
+
+ watchdog_unregister_device(wdd);
+ clk_disable_unprepare(dmt->clk);
+
+ return 0;
+}
+
+static const struct of_device_id pic32_dmt_of_ids[] = {
+ { .compatible = "microchip,pic32mzda-dmt",},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, pic32_dmt_of_ids);
+
+static struct platform_driver pic32_dmt_driver = {
+ .probe = pic32_dmt_probe,
+ .remove = pic32_dmt_remove,
+ .driver = {
+ .name = "pic32-dmt",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(pic32_dmt_of_ids),
+ }
+};
+
+module_platform_driver(pic32_dmt_driver);
+
+MODULE_AUTHOR("Purna Chandra Mandal <purna.mandal@microchip.com>");
+MODULE_DESCRIPTION("Microchip PIC32 DMT Driver");
+MODULE_LICENSE("GPL");
projects / linux-beck.git / commitdiff